docs: def add_transcription(self, gene: Gene, rna: Union[Rna, MicroRna]) -> str:
          """Add a transcription relation from a gene to an RNA or miRNA node.
  
          :param gene: A gene node
          :param rna: An RNA or microRNA node
          """
          return self.add_unqualified_edge(gene, rna, TRANSCRIBED_TO)